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Results tagged with power-supply
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user 77938
An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.
2
votes
Convert PC PSU from VAC input to 12VDC
There's the extremely inefficient approach of using the 12V DC to supply an inverter that outputs 120 to 230V AC, then plug the power supply into that.
Or the more efficient approach of throwing the …
- 20k
1
vote
What, Why dual power supply?
Voltages are really only measured between two points. You can say that the voltage between points A and B is 12V, and the voltage between C and D is 9V.
But that becomes tiresome after a while. It …
- 20k
1
vote
I have a Panasonic CD Player Model SL-PJ24A, and am wondering what Power cable I would need
From the picture in the manual, it looks very much like a C7 "figure of 8" connector. If so, these are very commonly used on small appliances.
- 20k
4
votes
Accepted
Understanding AC to DC Conversion Without a Transformer
It's a "capacitive dropper" supply. A capacitor has an impedance to AC. This means that it can be used for current limiting, like a resistor. But it has a huge advantage that the capacitor doesn't …
- 20k
2
votes
Accepted
How can Venezuela technically suffer a power outage in all its states at the same time?
What can stop functioning so direly that quite no electricity can reach anything?
Circuit breakers tripping.
Nationwide electricity systems tend to be arranged as complex grids of high voltage lines …
- 20k
0
votes
Selecting a power supply for a device with 625A 1ms peak current
The PDF datasheet available from the page you linked shows that the output current limiter can be set to 110A. So it's possible that four in parallel could supply up to 440A for a short period.
I'm …
- 20k
2
votes
I have an old hand built power supply, am I missing something?
I am still trying to get values on the current, I believe its less
than 5 A (that is the panel fuse). Am I correct that the variable
transformer is driving the primary?
The only way to work out the …
- 20k
1
vote
Electronic controlled trash can lid eats batteries
Rechargeable batteries need a proper charging circuit. If you simply connect 7.2V (6 x 1.2V) of AA cells to a 9V power supply, then there will be nothing to limit the current, and nothing to stop the …
- 20k
1
vote
DPST switch control 5vDC and 220vAC
Using a DPST switch like that, you need to be very careful about creepage distances between the mains and 5V USB terminals of the switch.
If there's any possibility of mains voltage leaking across th …
- 20k
2
votes
What does it mean that a power supply is 'referenced to mains' and why is that dangerous?
Most power supplies use a double-insulated transformer between the incoming mains and the outgoing extra low AC or DC voltage. This means that you will not get an electric shock if you touch one of t …
- 20k
1
vote
Powering DC 5v 120w from AC 110v
120W at 5V means you need a power supply that can put out 24A. That's a big current - more than any wall wart can produce. So you'd need a proper cased power supply, as Jack B suggested.
Also be aw …
- 20k
2
votes
Why don't most lab power supply units display the maximum current?
Most likely, because it's more difficult. A simple ammeter is an off-the-shelf component.
Working out what the current would be if you shorted the output terminals is another matter. That's especia …
- 20k
0
votes
Is there truely such a thing as a negative DC voltage (with reference to earth ground)?
Yes, it is. Your problem is that you're confusing the terminal that is called GND with the big ball of dirt that is the Earth. They may or may not be connected.
In your example, if you hammer an Ea …
- 20k
1
vote
Relay parallel to wall switch: Is it safe?
Yes, it's perfectly OK to wire a relay in parallel with a switch. If either the switch or the relay is on, the light will come on. That sounds like the OR function you are looking for.
Whether or no …
- 20k
0
votes
Accepted
Specs for an AC Power Bank as an Outlet Replacement
You need to know the wattage rating of the appliance, and the wattage rating of the power bank. These should be marked on the device itself, or at least on the box.
BUT...
Motorized appliances draw …
- 20k